EP0117728A2 - Guides de pièce - Google Patents

Guides de pièce Download PDF

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Publication number
EP0117728A2
EP0117728A2 EP84301180A EP84301180A EP0117728A2 EP 0117728 A2 EP0117728 A2 EP 0117728A2 EP 84301180 A EP84301180 A EP 84301180A EP 84301180 A EP84301180 A EP 84301180A EP 0117728 A2 EP0117728 A2 EP 0117728A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
guide
jaw members
axis
jaw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84301180A
Other languages
German (de)
English (en)
Other versions
EP0117728A3 (en
EP0117728B1 (fr
Inventor
Stanley George Wheeler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Newall Engineering Co Ltd
Original Assignee
Newall Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Newall Engineering Co Ltd filed Critical Newall Engineering Co Ltd
Publication of EP0117728A2 publication Critical patent/EP0117728A2/fr
Publication of EP0117728A3 publication Critical patent/EP0117728A3/en
Application granted granted Critical
Publication of EP0117728B1 publication Critical patent/EP0117728B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/065—Steady rests

Definitions

  • This invention relates to workpiece guides particularly for use in machine tools such as grinding machines in which an elongate rotary workpiece is supported on an intermediate position in its length and/or at its end for a machining operation.
  • U.S. Patent Specification No. 4276723 discloses a steady rest for supporting a workpiece to be ground comprising three contact shoes which are simultaneously movable towards and away from the workpiece centre-line so that workpieces of varying diameter can be supported and maintained on a fixed centre line of rotation.
  • the top contact shoe is mounted for pivotal movement to a position clear of the work area to facilitate loading unloading of the workpiece, one hydraulic operator being provided for pivoting the top contact shoe into and out of its operative position and a second operator being provided for moving the two lower non-pivoting contact shoes towards or away from a workpiece.
  • the invention provides a workpiece guide for supporting a rotary workpiece comprising a base, three jaw members movably mounted on the base to embrace and ; support a workpiece for rotation'about an axis defined by the positions of the jaw members, drive means for closing the jaw members to grip the workpiece and for releasing the member sufficiently to permit the workpiece to rotate therein whilst still supported coaxially with said axis by the jaw members, and means to adjust the jaw members to alter the position of the axis defined by the jaw members whereby the axis can be set to coincide with an axis of a machine tool on which the guide is to be used and a workpiece then supported on that axis in the guide.
  • the drawings illustrate a workpiece guide for a machine tool for supporting an elongate workpiece to be rotated at an intermediate position along the length of the workpiece and/or at an end of the workpiece to ensure that the workpiece axis coincides with the axis of rotation of the machine tool.
  • the workpiece guide is, by way of example, particularly applicable to grinding machines for grinding the cam lobes on motor vehicle camshafts. Examples of such machines are described and illustrated in our U.K. Patent No.1596635 and U.K. Patent Application No. 8217890.
  • FIG. 1 to 4 of the drawings there is shown a workpiece guide for use on a machine tool having a bed formed with a slideway on which centres or chucks are mounted to support a workpiece for rotation about a fixed axis extending parallel to the slideway.
  • the workpiece guide comprises a housing indicated generally by the reference numeral 10 to be mounted on the slideway of the machine tool bed.
  • the fixed axis of rotation of the machine tool is indicated at 11 and the housing has an open front 12 from which three workpiece guides 13, 14 and 15 project to encircle the axis 11 and support a workpiece for rotation on the axis as described below.
  • the housing comprises a base member 16 to which two upstanding parallel side walls 17, 18 are attached.
  • the housing is completed by a top wall 19 and rear walls 20, 21 and 22 all secured to the side walls by screws 23.
  • the front side of the housing is left open as indicated above for the guide members 13 to 15 to project from.
  • the housing is mounted with the base member 16 on the upper surface of the slide of a machine tool bed which is not illustrated.
  • the slideway is of dovetail cross-section and to lock the housing to the base the lower ends of the side walls 17, 18 at the front of the housing have downwardly projecting lugs 24 extending below the.basemember 16 which are undercut as indicated at 25 on the sides thereof facing across the base to engage one side of the dovetail section slideway.
  • the clamp 26 extends across the other side of the base member 16 and is undercut as indicated at 27 to enage the other side of the dovetail section slideway.
  • the clamp 26 is secured to the base 16 by means of screw threaded studs 28 projecting from the base member 16 through the clamp 26 to receive nuts 29 for tightening the clamp 26 against the side of the slideway to lock the housing to the slideway.
  • the sidewalls 17,18 of the housing are formed with oppositely facing coaxial circular apertures 30, 31, respectively.
  • the inner sides of the side walls around the apertures 30, 31 are rebated as indicated at 32 and 33 respectively to receive annular plates 34, 35 respectively which project into the apertures 30, 31 and are secured in the rebates by set screws 36.
  • a hollow cylindrical hub 37 extends through the annular plates 34,35 with clearance between the outer surface of the hub and the inner peripheries of the plates to permit radial adjustment of the hub in the plates.
  • One end of the hub located in the aperture in plate 17 is closed and is formed with an outwardly projecting integral flange 38 which bears on one side of the annular plate 34.
  • Set screws 40 countersunk into the flange 38 extend through the flange, with clearance through openings 41 in the plate 34 and into screw threaded bores 42 in the collar 39. With the screws 40 slackened to release the clamping pressure of the flange 38 and collar 39 to the ring 34, the end of the hub can be adjusted radially with respect to the annular plate 34. The screws 40 can then be tightened to lock the end of the hub in the required position of adjustment.
  • the hub 37 has a central bore 43 in which a shaft 44 is mounted in bearings 45 and 46.
  • the shaft 44 has an enlarged diameter portion 47 and the inner races of the bearings 45, 46 are lodged against the shoulders at the ends of the enlarged diameter portion.
  • the outer race of bearing 45 lies against the end of the bore 43 in the hub and the outer race of the bearing 46 is held in place by a sleeve 48 located in the hub and itself locked in place by an end cap 49 secured to the end of the hub by set screws 50.
  • the end cap 49 has a central bore 51 through which the shaft 44 extends with clearance.
  • the end of the shaft 44 projecting from the end cap 49 carries a toothed pulley 52 secured in place by a screw 53.
  • Set screws 50 also serve to secure an elongate plate 54 to the end cap, the plate extending to the rear of the housing.
  • a stepper motor 55 is mounted on the plate 54 and has a toothed output pulley 56 with a tooth belt drive 57 to the tooth pulley 52 to rotate the shaft 44 as described later.
  • the enlarged portion 47 of the shaft 44 carries three annular eccentric cams 58, 59 and 60 locked to rotate with the shaft 44 by keys 61.
  • the hub 37 encircling the eccentric cams 58 to 60 has three radial bushes 64 disposed at spaced locations around the hub and in line with the three respective cams and three push rods64a are mounted in the respective bushes to bear against the three respective cam surfaces 58 to 60.
  • the shaft 65 extends between and is mounted in bearings 66 secured in the side walls 17, 18 of the housing.
  • the shaft 65 supports a rocker arm 67 one end of which carries a pressure pad 68 which bears on the pushrod 64a acting on eccentric cam 58.
  • the other end of the lever arm projects from the forward end of the housing and carries the guide element 15 secured to the arm by a set screw 69.
  • the central part of the lever arm 67 around the shaft 65 is cut away as indicated at 70 in Figure 6 to provide a recess in which a further rocker arm 71 is pivotally mounted on the shaft 65 on a needle roller bearing 72.
  • the rocker arm 71 extends upwardly from the arm 67 towards the front end of the housing and the guide element 14 is secured to one side of the arm by a set screw 73 to project from the forward side of the housing.
  • the other side of the arm has a pressure pad 74 let into the arm against which the push rod 64a acting on the eccentric cam 59 bears.
  • a further lever arm 75 is pivotally mounted by means of needle roller bearings 76 on a spindle 77 supported at its ends in a double walled arm 78 one end of the arm 75 carries the guide element 13 secured thereto by set screw 79 and the other end of the arm has a pressure pad 80 let into the end of the arm which bears against a final pushrod 64a acting on the eccentric cam 60.
  • Each of the guide elements 13, 14 and 15 is provided with a small rectangular section steady tip 82 to engage the workpiece to be supported by the guide and by rotation of the shaft 44 and with it the eccentric cams 58 to 60, the guide elements are moved into engagement with the workpiece to support the workpiece for rotation about the axis 11 as will be described below.
  • the radial position of the hub 37 in which the shaft 44 is supported is adjusted by slackening the clamping collars 39 securing the hub to the annular plates 34, 35. Adjustment of the shaft 44 enables the axis 11 to which the guide elements 13, 14 and 15 close to be adjusted for alignment with the axis of rotation of the machine tool.
  • the double arm 78 supporting the lever 75 . is supported in the housing for movement between the operative position indicated in Figure 4 in a retracted position in which the lever arm 75 is retracted into the housing (as shown in Figure 1) to permit the workpieoe to be located in or removed from the guide by a mechanism which will now be described.
  • the double arm 78 is formed with a short L-section slot 85 in both parts of the arm in which a pin 86 is located. The ends of the pin locate in horizontal slots 87 formed in the side walls 17, 18 of the housing. The pin is thus constrained to slide horizontally in the slots in the housing.
  • a pivotal link 88 is connected at one end to the pin 86 between the two parts of the arm 78 and the other end of the link is connected by a further pin 89 to an arcuate link 90 as shown in Figure 4 which extends downwardly through the housing behind the hub assembly 37.
  • the lower end of the arm 90 is supported on a shaft 91 mounted in bearings 91ain the side walls 17 and 18 of the housing as shown in Figure 6.
  • a pin 90a is mounted on the arcuate arm 90 approximately halfway down the arm and projects laterally of the arm through arcuate slot 92 in the side wall 17 of the housing.
  • a pneumatic ram 93 is mounted on the side wall 17 of the housing towards the upper end thereof and acting in a downwardly inclined direction and the piston rod 94 of the ram is connected to the pin 90a on the arm 90.
  • the arcuate arm 90 is pressed towards the rear of the housing and, in so doing, retracts the lever arm 75 into the housing to allow a workpiece to be moved into or out of the postion by engagement by the guide element.
  • the ram 93 is retracted, the ana90 is drawn forwardly to extend the lever arm 75 into the operative position around the axis 11 to support a workpiece coaxial with the axis.
  • the workpiece guide is set up with a master component in the machine tool the axis of which coincides with the required degree of accuracy with the machine axis 11.
  • the workpiece steady tips are then closed on to the master component with the fixing screws securing the hub 37 to the annular plates 34,35 sufficiently slack to allow the hub to adjust automatically to the position required to hold the workpiece guides gripping the master component.
  • the hub is then locked in position and the guide is then ready for use.
  • the shaft 44 is driven by a stepper motor to contract and expand the workpiece guides 13, 14 and 15 around the workpiece to be supported in the guide. This enables the guide to be operated through an automatic cycle of the following steps initiated by operation of a cycle start button.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Turning (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP19840301180 1983-03-01 1984-02-23 Guides de pièce Expired EP0117728B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8305585 1983-03-01
GB08305585A GB2136715B (en) 1983-03-01 1983-03-01 Machine tool workpiece guides

Publications (3)

Publication Number Publication Date
EP0117728A2 true EP0117728A2 (fr) 1984-09-05
EP0117728A3 EP0117728A3 (en) 1986-08-27
EP0117728B1 EP0117728B1 (fr) 1988-05-11

Family

ID=10538768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840301180 Expired EP0117728B1 (fr) 1983-03-01 1984-02-23 Guides de pièce

Country Status (5)

Country Link
EP (1) EP0117728B1 (fr)
JP (1) JPS59161245A (fr)
DE (1) DE3471032D1 (fr)
ES (1) ES277800Y (fr)
GB (1) GB2136715B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0215760A2 (fr) * 1985-09-17 1987-03-25 Ab Knight Konsulterande Ingenjörer Lunette à centrage automatique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011051821A1 (de) * 2011-07-13 2013-01-17 Röhm Gmbh Lünette mit Elektroantrieb

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764493A (en) * 1954-04-27 1956-12-28 Drummond Brothers Ltd Improvements in or relating to work steadies for lathes
DE1090540B (de) * 1958-02-20 1960-10-06 Voegele Ag J Setzstock zum Schleifen, insbesondere langer Wellen
GB1155644A (en) * 1966-10-20 1969-06-18 Weyburn Engineering Company Lt Improvements in Work Steadies for use on Machine Tools
DE2141702A1 (de) * 1971-08-20 1973-02-22 Bruno Dietl Selbstzentrierende luenette
US4184293A (en) * 1977-09-16 1980-01-22 Usm Corporation Roll neckrest support
US4276723A (en) * 1979-10-09 1981-07-07 The Warner & Swasey Company Compensating steadyrest

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH425400A (de) * 1964-04-10 1966-11-30 Fischer Ag Georg Selbstzentrierende Lünette
JPS5016864B2 (fr) * 1971-08-30 1975-06-17

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764493A (en) * 1954-04-27 1956-12-28 Drummond Brothers Ltd Improvements in or relating to work steadies for lathes
DE1090540B (de) * 1958-02-20 1960-10-06 Voegele Ag J Setzstock zum Schleifen, insbesondere langer Wellen
GB1155644A (en) * 1966-10-20 1969-06-18 Weyburn Engineering Company Lt Improvements in Work Steadies for use on Machine Tools
DE2141702A1 (de) * 1971-08-20 1973-02-22 Bruno Dietl Selbstzentrierende luenette
US4184293A (en) * 1977-09-16 1980-01-22 Usm Corporation Roll neckrest support
US4276723A (en) * 1979-10-09 1981-07-07 The Warner & Swasey Company Compensating steadyrest

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET ENGINEERING RESEARCH, vol. 2, no. 11, November 1982, Melton Mowbray, Leicestershire, GB; S.M. SOBOLER et al.: "Faster and more accurate grinding of flexible parts in cylindrical grinders" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0215760A2 (fr) * 1985-09-17 1987-03-25 Ab Knight Konsulterande Ingenjörer Lunette à centrage automatique
EP0215760A3 (fr) * 1985-09-17 1989-06-07 Ab Knight Konsulterande Ingenjörer Lunette à centrage automatique

Also Published As

Publication number Publication date
EP0117728A3 (en) 1986-08-27
GB2136715B (en) 1985-12-18
GB2136715A (en) 1984-09-26
GB8305585D0 (en) 1983-03-30
ES277800Y (es) 1985-05-01
JPS59161245A (ja) 1984-09-12
ES277800U (es) 1984-10-16
EP0117728B1 (fr) 1988-05-11
DE3471032D1 (en) 1988-06-16

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